Question

What will come in place of question mark? ​50, 30, 40, 75, 170, ? Request you to please answer with detailed explanation of involved logic.

Answer 1

Wehave 50,30,40,75,170.
The series follows  the following pattern  
xn+1=n( xn 2 +5)...
(i) wherex1=50 Putn=1in
(i) ⇒x2=1( x1 2 +5)=( 50 2 +5)=30 Putn=2in
(i) x2+1=2( x2 2 +5)=2( 30 2 +5)=40
Similarly we get x5+1=5( x5 2 +5)=5( 170 2 +5)=5 ×(85+5)=450

Answer 2

Hope this helps you......